Table 4.

Criteria for Positive Tuberculin Skin Test for Pediatric Patient, by Risk Group^a,14

Induration ≥ 5 mm	Induration ≥ 10 mm	Induration ≥ 15 mm
Children in close contact with a contagious person with TB disease	Children at increased risk for disseminated disease, including children < 5 years old and children with other medical conditionsb	Children ≥ 5 years old without any risk factors
Children with possible TB disease due to clinical findings	Children born in or with recent travel to high-prevalence regions of the worldc
Children who are immunosuppressed, including HIV infection, or receiving immunosuppressive therapy	Children regularly exposed to adults who are living with HIV, homeless, users of illicit drugs, residents of nursing homes, incarcerated, or otherwise institutionalized.

TB = tuberculosis.

^aThese criteria apply regardless of previous bacille Calmette-Guérin immunization. Erythema alone at a tuberculin skin test site does not indicate a positive test result, rather the induration should be measured in millimeters. Tests should be read at 48 to 72 hours after placement.

^bHodgkin disease, lymphoma, diabetes mellitus, chronic renal failure, malnutrition.

^cAny country outside of the United States, Canada, Northern and Western Europe, New Zealand, and Australia.